如何通過引用來更改Perl變量？

Question

爲什麼打印8？爲什麼不$e更改$i？

my $i = 8; 

sub u 
{ 
    return \$i; 
} 

my $e = u(); 
$e = "eer"; 
print $i; #8 

Answer 1

參考文獻不是別名。你必須明確地解引用它們。

$$e = "eer"; # Store 'eer' into the variable referenced by $e 

是不一樣的

$e = 'eer'; # Store 'eer' into $e, discarding its previous content